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GREENSBORO, N.C. — Bobby Petrino turned Louisville into a top-10 team nearly a decade ago. Now, more than two years after a scandal derailed his career, Petrino is back with the Cardinals as they enter the Atlantic Coast Conference.The 53-year-old coach is out to show he is worthy of a second chance with the school he left for the NFL."I need to prove to myself and everybody else on a daily basis that this is the right decision," he said Monday during the second of the ACC's two-day preseason event.